In a re-investigation of the 1H n.m.r. spectrum of the title compound the chemical shift nonequivalence of the isopropyl methyl groups is attributed to the effective asymmetry of the phosphorus centre.
A. H. Cowley, M. J. S. Dewar, W. B. Jennings and W. R. Jackson, J. Chem. Soc. D, 1969, 482 DOI: 10.1039/C29690000482
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